Edward weston



(No Model.)

E WESTON.

INGANDESO'ENTLAMP. No. 292,720. 2 Patented Jan. 29, I884.

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UNITED STATES j PATENT @rricn.

EDWARD WESTON, or NEWARK, NEW JERSEY, ASSIGNOR TO THE UNITED STATES LEorRIo LIGHTING COMPANY, on NEW YORK, N. Y.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 292,720, dated January 29, 1884.,

Application filed September 15, 1883. (No model.) i

to cut out blanks in the form of slender strips or filaments from some carbonized material, the blanks being of the same general shape as that designed for the finished conductor, though somewhat larger. These blanks are carbonized, and then secured to thesupporting-con- Several difficulties, due to the shape of the blanks, are met with in their manufacture. For example, the widened clamping ends are not properly carbonized, and the completed carbons are often found to contain, or to rapidly develop when used, weak points, particularly at the junction of the widened ends with the narrow body or strip.

To overcome these objections and to produce a better carbon than heretofore are the objects of my invention, which consists, broadly, in forming independently the carbonized strips and clamping ends, and uniting the same by the deposition of carbon.

In carrying out my invention I cut strips or filaments ofthe desired length and of uniform width from sheets or strips of fibrous material or other carbonizable substances, such as the amorphous cellulose described by me in former patents. These strips I carbonize in the usual way. I also cut or stamp short pieces or stubs of greater width than the strips from the same or a similar material. The. strips and the stubs may then be treated in any of the usual ways, if so desired, after which I place the stubsin clamps connected with one conductor of a circuit and the strips in other clamps arranged to hold their ends in contact with the stubs, and connected to the other conductor of the circuit. Ithen passa current through the ends of the strips and stubs, surrounding both by an atmosphere of some hydrocarbon vapor, and raising the temperature of the joints sufiiciently to effecta deposit of carbon, and firmly unite the two. A very superior carbon is in this way produced, and one in which weak spots, such as are commonly met with in car- 'bons made in the usual way, are less liable to occur. y

In the accompanying drawings, Figure 1 represents a straight carbon strip or filament. Fig. 2, various forms of stub; Fig. 3, a strip. of carbon from which the stubs may be out. Fig. 4 is a view in elevation and part section of an apparatus for uniting the strips and stubs.

It is immaterial to the invention in what precise. shape the strips may be prepared. They may be in straight filaments, as in Fig. 1, or stamped out in shapes similar to that shown in Fig. 4, a designating the carbon. The stubs B may be of various shapes, some of which are indicated'in Fig. 2. I prefer to pre pare them, however, by first cutting out a strip, 0, of suificient width, perforating the same at given intervals, carbonizing. and treating the and provided in a similar way with bindingpostsb b. Arms 0 c, capable of being turned,

extend from the supports K, and are provided with suitable clamps, at (Z. The ends of a reversed circuit, L L, connect, respectively, with the posts a and b.

In using the apparatus carbonized stubs are inserted in the clamps H, and a carbonized strip in the clamps (I (Z, the strip being bent to the-shape of a loop or arch when originally straight. The arms 0 0 are then turned or adjusted, so that the ends of the'stripsa bear on the stubs B. The air in the receiver E is then withdrawn, and in its place a rarefied atmosphere of hydrocarbon vapor introduced. The circuit is then completed, and the junctions of the strip and stubs raised to a red heat. bon is by this means deposited around the joints, firmly uniting the stubs to the strips. The carbon may then be removed and mountcd in the usual way in a lamp.

I am aware that carbons for incandescent Jamps have been united to the metallic supporting-conductors by the deposition of metal and of carbon; but in all such cases the enlarged ends of the carbon have either been previous- ]y formed on the carbons or made up entirely by the deposited carbon and the strip by the deposited joint united inseparably to the supportin conductor. This I do not claim herein; but

What I now desire to secure byLetters Patent is- 1. The method herein described of manufacturing carbon conductors for incandescent lamps, which consists in independently forming and carbonizing the strips or filaments and the stubs or enlarged clamping-ends; and then Car uniting them by the deposition of carbon, substantially as set forth.

2. The method herein described of manu facturing carbon conductors for incandescent lamps,whieh consists in independently forming and carbonizing the strips and the stubs, placing the same in contact in a receiver containing an atmosphere of hydrocarbon, and passing a current through them, whereby carbon is deposited, and a permanent union efi'ected in the manner described.

3. A carbon conductor for incandescent lamps, consisting of a strip or filament, enlarged clamping ends, and connections of de posited carbon uniting the clamping ends to the strip, as herein set forth.

In testimony whereof I have hereunto set my hand this 13th day of September, 1883.

EDWARD \VESTON.

\ Vit11esses:

H.- A. BEOKMEYER, L. V. E. Inn-s. 

